Re: Pulse Gen /Alan's Software Thoughts?
Posted by
Alan Marconett KM6VV
on 2000-12-06 14:00:48 UTC
Hi Wally,
Yes, I can imagine the confusion in trying to follow my rambling
thoughts. Let me explain that I usually have several projects going at
once, and even more in the "thought process" queue.
Software efforts:
1. Jog program for 4th axis rotary table. (hand held computer).
2. Jog program for PC that can move ANY axis as linear or rotary.
3. Outgrowth of jog program that can do coordinated moves
(interpolation).
4. Variations of above in 4-phase for my old MaxNC stuff, as well as new
step/dir code for planned driver hardware.
5. CY-545 code to run stepper(s).
...
6. EMC, LINUX
Hardware efforts:
1. Hand held computer for Jog.
2. New step/dir drivers for BIGGER motors!
3. "Dream Machine" Mill (not too big) using ball screw parts I have
accumulated.
4. CY-545 multiple axis controller (back burner). Single channel working
nicely.
5. Want: Generic "black box" for step generation.
6. Another Sherline (2000) or FB-2/Grizzly mill?
Most if not ALL of the above are for my own "edification and
enjoyment". Just buying it is not the same thing! And stuff I build
seems to eventually result in software projects for someone who DOES pay
the bills! (Pick and place robotics, RDF, Automotive test computer,
etc).
Hope this is a clue to my thoughts, I wasn't thinking of Ball screws on
the little Sherline, but I can "Dream Machine", can't I?
And I LIKE the FlashCut box!
Alan KM6VV
PS, Santa, are you reading this?
Wally K wrote:
Yes, I can imagine the confusion in trying to follow my rambling
thoughts. Let me explain that I usually have several projects going at
once, and even more in the "thought process" queue.
Software efforts:
1. Jog program for 4th axis rotary table. (hand held computer).
2. Jog program for PC that can move ANY axis as linear or rotary.
3. Outgrowth of jog program that can do coordinated moves
(interpolation).
4. Variations of above in 4-phase for my old MaxNC stuff, as well as new
step/dir code for planned driver hardware.
5. CY-545 code to run stepper(s).
...
6. EMC, LINUX
Hardware efforts:
1. Hand held computer for Jog.
2. New step/dir drivers for BIGGER motors!
3. "Dream Machine" Mill (not too big) using ball screw parts I have
accumulated.
4. CY-545 multiple axis controller (back burner). Single channel working
nicely.
5. Want: Generic "black box" for step generation.
6. Another Sherline (2000) or FB-2/Grizzly mill?
Most if not ALL of the above are for my own "edification and
enjoyment". Just buying it is not the same thing! And stuff I build
seems to eventually result in software projects for someone who DOES pay
the bills! (Pick and place robotics, RDF, Automotive test computer,
etc).
Hope this is a clue to my thoughts, I wasn't thinking of Ball screws on
the little Sherline, but I can "Dream Machine", can't I?
And I LIKE the FlashCut box!
Alan KM6VV
PS, Santa, are you reading this?
Wally K wrote:
>
> Alan Marconett KM6VV <KM6VV@a...> wrote:
> > hi Wally,
> >
> > Good points. No, actually I was only thinking of the PulseGen
> hardware
> > for my software efforts. No driver for EMC planned. A TSR for DOS
> would
> > be a possibility, as would be "sharing" the driver (function call or
> > subroutine) code for other users.
> >
>
> Allan i am confused what your sofware efforts are. I do not
> understand what you are writing software for and what you are trying
> to do.
>
> > I hadn't stopped to consider the speed issues, as I am thinking
> from a
> > "small mill" mentality. Probably nothing bigger then a FB-2 or
> Grizzly,
> > or perhaps a "Dream Machine" of similar proportions, from what I
> gather.
> > 200 IPM! In my current mindset, 20 IPM is fast! But yes, I
> > understand.
> > I recall seeing the 14 I.C. figure too, I need to see what Mariss
> has
> > for a schematic, or study the block diagram a little more.
> >
> > The 5tpi is something to think about. I have 20 tpi on the little
> > Sherline, and a few pairs of what I think are 8tpi. x 3/8". I think
> > they may possibly be metric, as the shaft end was not a simple
> English
> > dimension, and some of the 3/16" (?!) hardware associated with them
> > turned out to be metric! Anyway, I am just realizing that the belt
> > reduction used with ball screws must also be to get more
> steps/inch, not
> > just for power as I originally surmised. Would have been nice to
> drive
> > them direct with a flex coupler. What steps/in should I be shooting
> > for? And what's realistic?
> >
> > I'd appreciate your input.
> >
> > Alan KM6VV
>
> First, i do not follow the small mill stuff to closely. I think many
> people use the existing screws and direct drive them. It would not
> be realistic to change these screws to 5TPI from 20TPI for several
> reasons. First reason cost. Second reason Larger steppers would be
> required as more force would be needed to turn the screw. Third no
> performance gain. My calcs show that a 20 tpi screw directly driven
> to 20ipm with half steps will take 2.67K PPS. This number of pulses
> is easly obtainable with software. If you use full steps you only
> need 1.33K PPS and will get a step resolution of .00025" per step.
>
> It seems to me with this resolution there is no need for further belt
> reduction and you should directly drive the 20tpi screw with a zero
> backlash flex coupling.
>
> Wally K.
>
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